Biofeedback trainer for monitoring and displaying brain wave activity



FIG. 1 is a front elevational view of a biofeedback trainer for monitoring and displaying brain wave activity showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a right side elevational view thereof, the left side being the same in appearance as the right side. 

The ornamental design for a biofeedback trainer for monitoring and displaying brain wave activity, as shown and described. 